Incorrect.
It was the UK police who told the PJ to investigate the mccanns.
Likewise, in any missing children cases, investigating the parents is a matter of course.
We have discussed this many, many times on the forum and you are perpetuating a myth while demonstrating that it was necessary for the UK police to take the extraordinary initiative of instructing the investigation on basic investigative procedures.
However it will be remembered by you that the Portuguese authorities declared unequivocally that there was no evidence to justify the Drs McCann being constituted arguidos and no evidence they had any hand in Madeleine's disappearance.
Far from the Portuguese press at the time terming them 'persons of interest' which is apparently the closest description we have for arguida/o ... they were quite categorically labelled as suspects.
Many of the opinions held today have been formed by the reporting at the time. The lurid headlines could not have failed to influence public opinion at the time to the detriment to the search for Madeleine.
Particularly as their power is demonstrated by those who still subscribe to the perceived wisdom of the time ... despite all being subsequently overturned.